patch07 addendum: reduce compile size Hub

[benjaminbollen]

problem: patch 7 consumes more compiled size than Hub.sol has available

• rolled back the gas optimisations of patch 7 on the non-frequented path (ie. stop, stopped, registerHuman etc where the difference was already small), but kept the gas optimisations on the frequented paths of ERC1155 transfers, and demurrage calculations (esp in path transfers)
• to make up for the additional compile size needed, moved the helper functions in Hub for inflationary balanceOf and safe(Batch)Transfer out of hub and into a helper operator contract that people must authorize in order to have it help convert inflationary amounts to demurrage amounts and then execute the transferFrom

[benjaminbollen]

included in #42